PHP SplHeap insert() Function

The SplHeap::insert() function is an inbuilt function in PHP which is used to insert an element in the heap by sifting it up.

Generally, the Heap Data Structure are of two types:

• Max-Heap: In a Max-Heap the key present at the root node must be greatest among the keys present at all of its children. The same property must be recursively true for all sub-trees in that Binary Tree.
• Min-Heap: In a Min-Heap the key present at the root node must be minimum among the keys present at all of its children. The same property must be recursively true for all sub-trees in that Binary Tree.

Syntax:

void SplHeap::insert( mixed $value )

Parameters: This function accept one parameter i.e. $value that is to be insert into the heap.

Return Value: This function does not return any value.

Below programs illustrate the SplHeap::insert() function in PHP:

Example 1:

<?php 

// Create a new empty Min Heap 
$heap = new SplMinHeap(); 

// Inset elements in min heap
$heap->insert('System'); 
$heap->insert('GFG'); 
$heap->insert('ALGO'); 
$heap->insert('C');
$heap->insert('Geeks'); 
$heap->insert('GeeksforGeeks'); 

// Loop to display the max heap elements
for ($heap->top(); $heap->valid(); $heap->next()) {
    echo $heap->current() . "\n";
}

?>

Output:

ALGO
C
GFG
Geeks
GeeksforGeeks
System

Example 2:

<?php 

// Create a new empty Max Heap 
$heap = new SplMaxHeap(); 

// Insert elements in max heap
$heap->insert('System'); 
$heap->insert('GFG'); 
$heap->insert('ALGO'); 
$heap->insert('C');
$heap->insert('Geeks'); 
$heap->insert('GeeksforGeeks'); 

// Loop to display the min heap elements
for ($heap->top(); $heap->valid(); $heap->next()) {
    echo $heap->current() . "\n";
}

?>

Output:

System
GeeksforGeeks
Geeks
GFG
C
ALGO

Reference: https://www.php.net/manual/en/splheap.insert.php